Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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Apple Retail Stores Receiving New Promotional Materials Ahead of WWDC
9 to 5 Mac reports that Apple's retail stores are receiving shipments of new promotional materials that are set to remain sealed until Tuesday, suggesting that Apple will indeed have something new to show off in its stores following its Worldwide Developers Conference (WWDC) keynote on Monday.
Whether the promotional materials are for new software and services such as Mac OS X Lion and iCloud or for hardware products such as new AirPort and Time Capsule base stations is unknown.